docker: add sleep in mysql healthcheck #35906

Job	Run time
build-matrix	21s
ng-default (n22.11.0/j23)	5m 46s
ng-default-additional (n22.11.0/j17)	2m 0s
ng-mysql-es-noi18n-mapsid (n20/j17)	17m 37s
ng-mongodb-kafka-cucumber (n20/j21)	1m 39s
ng-h2mem-ws-nol2 (n22.11.0/j21)	1m 45s
ng-gradle-fr (n20/j23)	1m 50s
ng-gradle-mariadb-oauth2-infinispan (n20/j23)	2m 5s
ng-gradle-h2disk-ws-nocache (n20/j23)	1m 45s
ng-webflux-mongodb (n20/j21)	1m 45s
ng-webflux-gradle-mongodb-oauth2 (n20/j21)	3m 14s
ng-webflux-psql-default (n20/j23)	2m 19s
ng-webflux-psql-additional (n20/j23)	1m 31s
ng-webflux-gradle-session-h2mem-es (n18/j17)	1m 36s
ms-ng-oauth2-mongodb-caffeine (n18/j17)	2m 11s
mf-ng-eureka-jwt-psql-ehcache (n22.11.0/j17)	2m 19s
ms-mf-ng-consul-oauth2-neo4j (n22.11.0/j17)	5m 15s
check-angular	1s
	54m 59s

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